finish adding Out of Scope heading

Out of Scope heading, put scrollability aspect first so it's less likely to be missed after all the pseudo-stuff

Author: tantek

css-scrollbars-1/Overview.bs

@@ -46,6 +46,11 @@ For addressing these use-cases, this module adds properties to control the color
 width of scrollbars (if any) of an element.
 
 <h4 id="out-of-scope">
+Out Of Scope</h4>
+Layout of scrollbars and related or adjacent content, and whether content is scrollable, is out of scope.
+Those features are specified in the 
+<a href="https://drafts.csswg.org/css-overflow/">CSS Overflow Module</a>.
+
 Pseudo-elements for selecting specific parts of a scrollbar are out of scope.
 The WebKit implementation of pseudo-elements for scrollbar is
 considered to be a feature mistakenly exposed to the web.
@@ -57,10 +62,6 @@ Main concerns against the pseudo-elements approach are:
  because authors would need to take not only engine but also platforms into account.
 </ul>
 
-Layout of scrollbars and related or adjacent content, and whether content is scrollable, is out of scope.
-Those features are specified in the 
-<a href="https://drafts.csswg.org/css-overflow/">CSS Overflow Module</a>.
-
 <h3 id="values">
 Value Definitions</h3>